The five stages of memorizing the lyrics of any particular song

1. You learn the tune and you hum along to that.

2. You learn the chorus, as that's repeated the most often.

3. You learn most of the words and can sing along when you hear the song, but not when it's not playing.

4. You learn every single word and can sing the song without the benefit of it being played, including the intricacies of the guitar and/or other instrumental solos.

5. You know the song so well you start screwing up the lyrics because you're anticipating what's coming up later in the song.